98 ON THE tOSSiL CORALS OP THl! 



mouths of which open as simple, equal, circular, smooth-edged cells on 

 the surface, and hare numerous transverse diaphragms at variable 

 distances ; intervals between the tubes occupied by a cellular network 

 of small vesicular plates, or capillary tubules traversed by diaphragms." 

 This genus has no radiating lamellae, a character which constitutes 

 the only difference between it and HelioUtes (Dana). 



FiSTULiPORA Canadensis (Billings). 



FiSTULiPORA Canadensis. Billings, Geo. Sur. Canada, Rep. for 

 1857, p. 165 ; Can. Nat. and Geologist, Vol. III. p. 420. 



Fig. 1. Fistulipora Canadensis, 



Corallum forming sub-pyriform, irregular, contorted masses^ or 

 wide, flat, undulating expansions or layers, from one-half of an inch to 

 one inch in thickness, which are based upon a thin, concentrically 

 wrinkled epitheca. Cell-tubes half a line or less in diameter, and 

 about one line distant from each other; the mouths of the tubes 

 protruding a little above the general surface. Transverse diaphragms 

 thin, horizontal or flexuous, and sometimes very numerous, there being 

 in some of the tubes three or four in half a line of the length of the 

 tube. The intercellular tubules are polygonal, and about four in the 

 diameter of one of the principal cells ; their transverse diaphragms 

 are well developed, usually four or five to one line of the length. 



F. Canadensis differs from the other described species in the follow- 

 ing respects :— From F. decipiens (McCoy) in having the cell-tubes 

 more distant and the diaphragms more numerous, and from F. minor 

 (McCoy) in the same particulars, the cell-tubes of the latter species 

 being still smaller and closer together than in F. decipiens. 



This coral much resembles HelioUtes porosa (Goldfuss), but can 

 be readily distinguished by the absence of the radiating septa. 



Locality and Formation.— J}&\on\Qxv ; Corniferous or Onondaga 

 limestone ; lot 6, con. 1, Township of "Wainfleet ; at the east end of 

 Lake Erie. 



